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| hank Member Since: 12 Sep 2016 Location: South Wales Posts: 2231   
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Likely to be injector blow by - when you replaced the copper injector seal washers did you clean the injector bore and seat in the head until bright clean aluminium was exposed? If not then the new seals are sealing against carbon buildup and they won't seal. You need to get them spotless to get a seal that will last any time as shown in the below photo.
Also did you use quality washers? As the cheap ebay ones are copper coated steel which do not deform like soft copper to create a seal. Some further info in the following threads https://www.defender2.net/forum/topic74338.html https://www.defender2.net/forum/topic67028.html https://www.defender2.net/forum/topic74929.html https://www.defender2.net/forum/topic74792.html If it is not this then could be piston blow by and need rings or more  Click image to enlarge > 110 XS Double Cab > Instagram @simonlanemind |
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22nd Jun 2022 11:23am |
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| Puma22 Member Since: 22 Jun 2022 Location: North Yorkshire Posts: 29 
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Hello, many thanks.
I did use quality washers, but I didnt clean the seat. It only has 50k miles, so i think blow by is unlikely, but I will certainly pull the injectors back out and clean the seats to see if this helps. Glad that I am on the right lines! |
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22nd Jun 2022 11:26am |
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| hank Member Since: 12 Sep 2016 Location: South Wales Posts: 2231
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I've done this job four or five times now and was only successful the final time when I got rid of all traces of buildup.
A brass bottle brush (ebay) in a drill gets the bores nice and clean. I used a 15mm flat seat cutter to get the seats clean just be careful not to take off any aluminium! As a side note, are the four wells where the injectors come through the plastic rocker cover wet/oily? If so then this is a sure sign of injector blow by. For reference mine were full of oil but have been bone dry since I last did the seals in August 2021 > 110 XS Double Cab > Instagram @simonlanemind |
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22nd Jun 2022 12:35pm |
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| LRnovice Member Since: 08 May 2008 Location: Cardiff Posts: 59 
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I had a similar problem on my 2008 Puma defender. The main dealer finally diagnosed it as a blocked breather pipe from cam cover to air inlet although injector seals were also replaced.
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22nd Jun 2022 10:12pm |
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| Puma22 Member Since: 22 Jun 2022 Location: North Yorkshire Posts: 29
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Yes they are/were. At least cylinder 1-2 were. I have ordered a seat cleaning set and will be getting to this over the weekend. Hopefully I can report back some good news. I have also decided to replace the rocker cover gasket based on the information from the threads quoted above. |
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22nd Jun 2022 10:27pm |
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| Puma22 Member Since: 22 Jun 2022 Location: North Yorkshire Posts: 29
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I did have a look at this, but my breather is working well, there is just too much pressure in the crank case. I stripped it down and believe there is no valve/filter on the breather system for the Puma 2.2, so blockages would be less likely for my engine. |
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22nd Jun 2022 10:29pm |
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| Big Harold Member Since: 09 Jul 2018 Location: nsw Posts: 71  
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I had this missing on one cylinder and heaps of blow by.
Also came up with a miss fire code. Result was one holed piston. Mark |
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23rd Jun 2022 12:12am |
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| hank Member Since: 12 Sep 2016 Location: South Wales Posts: 2231
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If it's only wet on cylinders 1 and 2 then that is a good indication that the pressure is coming straight up these injector bores and out of the rocker cover seals so hopefully won't be anything more sinister.
Don't forget new bolts for the injector clamps  > 110 XS Double Cab
> Instagram @simonlanemind |
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23rd Jun 2022 12:29pm |
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| Puma22 Member Since: 22 Jun 2022 Location: North Yorkshire Posts: 29
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Click image to enlarge Click image to enlarge Today I’ve had all four injectors out and cleaned the seats. Picture doesn’t show it, but they were very clean. New washers and bolts fitted, symptom’s are still there. When I remove the injectors, they are all coated in diesel on the bottom. How tight can I clamp down the injectors before it’s ‘too tight’/sears. Note this is a 2015 defender, so seems strange all seals went at the same time that I got a lumpy tick over. But if I go for a drive, I get lots of white smoke, I thought that I might get a code up, but no luck. |
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24th Jun 2022 8:00pm |
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| Big Harold Member Since: 09 Jul 2018 Location: nsw Posts: 71
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When you removed injectors did you refit them into the same cylinder?
Have you inspected the seats for scratches or marks. White smoke is unburnt fuel so you either have a compression problem or an over fueling issue. Mark |
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25th Jun 2022 3:51am |
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| Puma22 Member Since: 22 Jun 2022 Location: North Yorkshire Posts: 29
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I have cleaned each seat and I refitted them into the correct positions. I have 1 new injector, so I changed each injector 1 at a time and reprogrammed the ECU with the code. Again, this didn’t help.
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25th Jun 2022 8:03am |
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| mwestcrew Member Since: 09 Dec 2019 Location: South Warwickshire Posts: 216 
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Reading what you have tried so far I’m afraid my money is on a holed piston. 2011 130 Utility Body
2005 110 Van |
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25th Jun 2022 8:24am |
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| Puma22 Member Since: 22 Jun 2022 Location: North Yorkshire Posts: 29
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I would agree if it were one injector. However it is all four, a holed piston would only create this problem on the injector in question?
I feel like I’m not tightening the injector clamp down enough. |
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25th Jun 2022 10:09am |
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| Big Harold Member Since: 09 Jul 2018 Location: nsw Posts: 71
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Did you replace all the injector hold down bolts?
What torque are you doing the bolts to? Maybe try and anneal the copper washer. |
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25th Jun 2022 10:20am |
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